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Covered Assets and Indemnification Asset - Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Changes in the allowance for loan losses            
Balance, beginning of period     $ 60,957      
Provision (recovery) for loan losses $ 340 $ 5,853 (1,467) $ 7,558    
Balance, end of period 59,996   59,996      
Loan portfolio distributed by portfolio segment and impairment methodology            
Total loans         $ 6,384,660 $ 6,273,669
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Total loans, allowance 59,996   60,957   59,996 60,957
Covered            
Changes in the allowance for loan losses            
Balance, beginning of period 2,823 753 2,729 413    
Provision (recovery) for loan losses (795) 960 (704) 1,456    
Loans charged off (57) (362) (57) (527)    
Recoveries on charged off loans 3 8 6 17    
Balance, end of period 1,974 1,359 1,974 1,359    
Loan portfolio distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment         85,497 95,016
Total loans         160,970 182,129
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment, allowance         23 32
Total loans, allowance 2,823 753 2,729 413 1,974 2,729
Covered | Commercial and industrial            
Changes in the allowance for loan losses            
Balance, beginning of period 45 16 24 35    
Provision (recovery) for loan losses (26) 28 (5) 12    
Loans charged off       (6)    
Recoveries on charged off loans   3   6    
Balance, end of period 19 47 19 47    
Loan portfolio distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment         791 861
Total loans         938 1,055
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment, allowance         4 5
Total loans, allowance 45 16 24 35 19 24
Covered | Real estate            
Changes in the allowance for loan losses            
Balance, beginning of period 2,776 736 2,702 378    
Provision (recovery) for loan losses (764) 309 (690) 822    
Loans charged off (57) (362) (57) (521)    
Recoveries on charged off loans   1   5    
Balance, end of period 1,955 684 1,955 684    
Loan portfolio distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment         83,346 92,444
Total loans         158,672 179,359
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment, allowance         19 24
Total loans, allowance 2,776 736 2,702 378 1,955 2,702
Covered | Construction and land development            
Changes in the allowance for loan losses            
Balance, beginning of period 2 1 3      
Provision (recovery) for loan losses (5) 623 (9) 622    
Recoveries on charged off loans 3 4 6 6    
Balance, end of period   628   628    
Loan portfolio distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment         1,360 1,711
Total loans         1,360 1,715
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Loans collectively evaluated for impairment, allowance           3
Total loans, allowance 2 $ 1 3 $ 628   3
Covered | PCI loans            
Changes in the allowance for loan losses            
Balance, beginning of period     2,697      
Balance, end of period 1,951   1,951      
Loan portfolio distributed by portfolio segment and impairment methodology            
Total loans         75,473 87,113
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Total loans, allowance 1,951   2,697   1,951 2,697
Covered | PCI loans | Commercial and industrial            
Changes in the allowance for loan losses            
Balance, beginning of period     19      
Balance, end of period 15   15      
Loan portfolio distributed by portfolio segment and impairment methodology            
Total loans         147 194
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Total loans, allowance 15   19   15 19
Covered | PCI loans | Real estate            
Changes in the allowance for loan losses            
Balance, beginning of period     2,678      
Balance, end of period 1,936   1,936      
Loan portfolio distributed by portfolio segment and impairment methodology            
Total loans         75,326 86,915
Allowance for loan losses distributed by portfolio segment and impairment methodology            
Total loans, allowance $ 1,936   $ 2,678   $ 1,936 2,678
Covered | PCI loans | Construction and land development            
Loan portfolio distributed by portfolio segment and impairment methodology            
Total loans           $ 4